New Challenges in Residual Stress Measurements and Evaluation最新文献

Nondestructive Characterization of Residual Stress Using Micromagnetic and Ultrasonic Techniques 利用微磁和超声技术无损表征残余应力

New Challenges in Residual Stress Measurements and Evaluation Pub Date : 2020-01-16 DOI: 10.5772/intechopen.90740

M. Rabung, M. Amiri, M. Becker, M. Kopp, R. Tschuncky, I. Veile, Fabian Weber, Miriam Weikert-Müller, K. Szielasko

{"title":"Nondestructive Characterization of Residual Stress Using Micromagnetic and Ultrasonic Techniques","authors":"M. Rabung, M. Amiri, M. Becker, M. Kopp, R. Tschuncky, I. Veile, Fabian Weber, Miriam Weikert-Müller, K. Szielasko","doi":"10.5772/intechopen.90740","DOIUrl":"https://doi.org/10.5772/intechopen.90740","url":null,"abstract":"Material processing and service loads in different lifecycle stages of a product — ranging from semi-finished goods to operating structures — lead to an unfavorable superposition of residual stresses, especially of micro- and macro-residual stresses. Whereas near-surface compressive stress is often desired as it prolongs the useful service life, undesired, steep stress gradients and tensile stress at the surface pro-mote the occurrence of cracks and wear during operation, ultimately leading to expensive and possibly dangerous premature component failure. Reliable manage-ment of the residual stress condition significantly contributes to the assessment and optimization of a part ’ s or component ’ s lifetime. Therefore, the nondestructive evaluation of residual stress in objects of different scales reaching from laboratory samples over semi-finished products up to operating components and structures has gained significant importance in the latest decades. Micromagnetic and ultrasonic methods are based on the interaction of an external magnetic field or an ultrasonic wave, respectively, with the material ’ s microstructure and residual stress fields on different scales and in different depths from the material surface. The present contribution provides an overview regarding the local and volumetric measurement, characterization and evaluation of macro- and micro-residual stress by means of micromagnetic and ultrasonic techniques.","PeriodicalId":395727,"journal":{"name":"New Challenges in Residual Stress Measurements and Evaluation","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123376677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Opto-Acoustic Technique for Residual Stress Analysis 残余应力分析的光声技术

New Challenges in Residual Stress Measurements and Evaluation Pub Date : 2019-12-24 DOI: 10.5772/intechopen.90299

S. Yoshida, T. Sasaki

{"title":"Opto-Acoustic Technique for Residual Stress Analysis","authors":"S. Yoshida, T. Sasaki","doi":"10.5772/intechopen.90299","DOIUrl":"https://doi.org/10.5772/intechopen.90299","url":null,"abstract":"Residual stress analysis based on co-application of acoustic and optical techniques is discussed. Residual stress analysis is a long-standing and challenging problem in many fields of engineering. The fundamental complexity of the problem lies in the fact that a residual stress is locked into the material and therefore hidden inside the specimen. Thus, direct measurement of residual stress in a completely nondestructive fashion is especially difficult. One possible solution is to estimate residual stress from the change in the elastic constant of the material. Residual stress alters the interatomic distance significantly large that the elastic constant is considerably different from the nominal value. From the change in the elastic constant and knowledge of the interatomic potential, it is possible to estimate the residual stress. This acoustic technique (acoustoelasticity) evaluates the elastic modulus of the specimen via acoustic velocity measurement. It is capable of determining the elastic modulus absolutely, but it is a single-point measurement. The optical technique (electronic speckle pattern interferometry, ESPI) yields full-field, two-dimensional strain maps, but it requires an external load to the specimen. Co-application of the two techniques compensates each other ’ s shortfalls.","PeriodicalId":395727,"journal":{"name":"New Challenges in Residual Stress Measurements and Evaluation","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134598961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Residual Stress Modeling and Deformation Measurement in Laser Metal Deposition Process 激光金属沉积过程中残余应力建模与变形测量

New Challenges in Residual Stress Measurements and Evaluation Pub Date : 2019-12-18 DOI: 10.5772/intechopen.90539

Heng-Liang Liu, F. Liou

{"title":"Residual Stress Modeling and Deformation Measurement in Laser Metal Deposition Process","authors":"Heng-Liang Liu, F. Liou","doi":"10.5772/intechopen.90539","DOIUrl":"https://doi.org/10.5772/intechopen.90539","url":null,"abstract":"Direct metal deposition (DMD) has become very popular within the space of rapid manufacturing and repair. Its capability of producing fully dense metal parts with complex internal geometries, which could not be easily achieved by traditional manufacturing approaches, has been well demonstrated. However, the DMD process usually comes with high thermal gradients and high heating and cooling rates, leading to residual stresses and the associated deformation, which can have negative effect on product integrity. This paper studies the features of thermal stress and deformation involved in the DMD process by constructing a 3-D, sequentially coupled, thermomechanical, finite element model to predict both the thermal and mechanical behaviors of the DMD process of Stainless Steel 304 (SS 304). A set of experiments were then conducted to validate deformation using a laser displacement sensor. Comparisons between the simulated and experimental results show good agreement. This model can be used to predict the mechanical behavior of products fabricated by the DMD process and to help with the optimization of design and manufacturing parameters.","PeriodicalId":395727,"journal":{"name":"New Challenges in Residual Stress Measurements and Evaluation","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121699943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Recent Advancements in the Hole-Drilling Strain-Gage Method for Determining Residual Stresses 测定残余应力的钻孔应变计法的最新进展

New Challenges in Residual Stress Measurements and Evaluation Pub Date : 2019-12-13 DOI: 10.5772/intechopen.90392

E. Valentini, L. Bertelli, A. Benincasa, S. Gulisano

引用次数: 0